Mouth (mouth) " n. Pl. Mouths 1. A. The body opening through which an animal takes in food. B. The cavity lying at the upper end of the alimentary canal, bounded on the outside by the lips and inside by the oropharynx and containing in higher vertebrates the tongue, gums, and teeth. C. This cavity regarded as the source of sounds and speech. D. The opening to any cavity or canal in an organ ".
...Read more

2

Various reasons :
Do you have it all the time or only when you eat certain foods. Food allergies, mineral deficiencies, hormone abnormalities , toxic substances are just some of the reasons you could be having a bitter taste .
...Read more

3

Bitter taste from...:
Common causes of a bitter taste in the mouth include acid reflux, taking certain medications or even poor oral hygiene. Your sense of taste can also be impaired or distorted permanently from long-term smoking. Finally, a sudden bitter taste in the mouth can be a sign of an infection or other condition that requires immediate treatment. See your dentist for an evaluation.
...Read more

5

Find the cause...:
Common causes of a bitter taste in the mouth include acid reflux, taking certain medications or even poor oral hygiene. Your sense of taste can also be impaired or distorted permanently from long-term smoking. Finally, a sudden bitter taste in the mouth can be a sign of an infection or other condition that requires immediate treatment. See your dentist to determine the cause.
...Read more

7

Tough problem:
Lots of people complain about this problem with clarithromycin. You can take it with food, that helps. But they also complain it ruins the taste of the food they've eaten. Other folks have reported they take the medicine and immediately brush their teeth, suck on hard candy or chew really strong chewing gum. Good luck...hopefully you won't be on it for long.
...Read more

8

See below:
This is a problem that necessitates a face-to-face meeting with your doctor. This will allow him/her to examine you, ask specific questions. And possibly order tests to find out what's wrong and what to do to help you.
...Read more

9

Dysgeusia:
Dysgeusia is the medical term for an impaired sense of taste. It can result in unpleasant taste sensations ranging from metallic to salty or bitter. The bad taste may also be described as foul or rancid. The severity of the bad taste varies among affected individuals. Dysgeusia can be caused by infections, inflammation, injury, or environmental factors.
...Read more

13

A few causes :
Bitter taste in your mouth can come from dental cavities or gum disease. It may also come from acid reflux from your stomach or sinus drainage down your throat. If it continues longer than 2 weeks consider seeing your doctor and dentist.
...Read more

14

Symptom not disease:
Whether dietary, due to drugs or a physical condition, a metal taste is a the main reason for a metal taste is something in your system that is reacting with your body chemistry to produce a metal taste.
A metallic taste in the mouth, or dysgeusia, is a common side effect of a wide variety of medical treatments and medications, and is sometimes a symptom of a medical condition.
...Read more

20

Tonsillitis:
Yes, it absolutely can. Even more exciting is when you have tonsil calculus or tonsil stones. These are little white pellet-looking things that fill the pits or crypts in your tonsils. Not only will they taste bitter, but they'll give you some pretty foul smelling breath, so you won't be the only one who gets to experience them. If this is a chronic problem, you should get it checked out.
...Read more

Bitter tastes is a symptom in which a person senses a bitter taste when he is not eating or drinking bitter foods. A bitter taste can come from gastroesophageal reflux disease (GERD) where stomach liquids make their way up to the throat, from some medicines, from some foods, etc...
...Read more